复杂地层明挖地铁车站基坑施工稳定性数值模拟研究OA

The excavation of foundation pit of subway station is a process of stress unloading,which will cause horizontal or vertical deformation of supporting structure and site,so the stability of foundation pit is particularly important.Taking Hechuan Road Station of Qingdao Metro Line 2 as the engineering background,the stability of open-cut foundation pit is studied.Based on the finite element analysis software,the Mohr-Coulomb constitutive model is used to establish a three-dimensional numerical analysis model considering the actual site conditions,excavation and support process.The evolution law of horizontal displacement of pile and vertical displacement of ground surface during layered excavation and support of foundation pit is studied.The stress and deformation characteristics of pile + internal support system during construction are analyzed.The numerical calculation results are compared with the monitoring data.It is concluded that the numerical simulation results are basically consistent with the field measurement results,which can provide reference experience for similar projects in Qingdao area.